Air purification and dustproof window / door manufactured using titanium dioxide nanofibers

Abstract

The present invention relates to an air purification and dustproof window / door manufactured using titanium dioxide nanofibers, and more specificially, relates to a titanium dioxide-filled dustproof net which not only blocks external contaminants such as fine dust, ultrafine dust, and yellow dust but also exhibits excellent air permeability, flame retardant performance, NOx removal efficiency, and visible light transmittance.

Description

Fabrication of air-purifying and dustproof windows using titanium dioxide nanofibers

[0001] The present invention relates to the production of air-purifying and dustproof windows using titanium dioxide nanofibers, and more specifically, to a titanium dioxide-filled dustproof net that not only blocks external pollutants such as fine dust, ultrafine dust, and yellow dust, but also has excellent breathability, excellent flame retardant performance, and excellent NOx removal efficiency and visible light transmittance.

[0002] Generally, windows in residential buildings such as houses and apartments are typically equipped with mesh-type insect screens that block pests like mosquitoes and flies while allowing ventilation. These screens are widely used and made from a variety of materials, ranging from synthetic fibers like nylon and polyester to fine metal meshes such as aluminum and stainless steel, and more recently, products utilizing glass fiber. However, recently, the frequency of harmful (ultra)fine dust entering indoors through conventional insect-blocking screens has increased, raising concerns about respiratory diseases caused by this fine dust. Consequently, people are hesitant to open windows for ventilation with the assurance that conventional screens alone are sufficient. In other words, while ventilation is essential for residential living due to various indoor air pollutants generated by asbestos, radon, bacteria, formaldehyde, cooking, and the use of electronic devices, people are reluctant to ventilate due to external harmful substances such as fine dust.

[0003] Therefore, there is an urgent need to develop a new type of insect and dust-proof screen capable of blocking not only pests, which is the function of conventional insect screens, but also harmful fine dust.

[0004] The present invention has been devised in consideration of the above points, and aims to provide a titanium dioxide-added nano dust-proof mesh that not only has high dust collection efficiency but also excellent air permeability, excellent flame retardant performance, and excellent NOx removal efficiency and visible light transmittance.

[0005] To solve the above-mentioned problem, the titanium dioxide-added nanodust-proof mesh of the present invention comprises a first fabric, a nanofiber web, and a second fabric sequentially laminated, wherein the nanofiber web may include polyvinylidene fluoride and reduced titanium dioxide.

[0006] As a preferred embodiment of the present invention, the nanofiber web may contain polyvinylidene fluoride and reduced titanium dioxide in a weight ratio of 1:0.05 to 0.3.

[0007] As a preferred embodiment of the present invention, the first fabric may be woven into a square mesh shape using PAN (polyacrylonitrile)-based carbon fibers coated with polyvinyl chloride having a weight-average molecular weight of 38,000 to 58,000 on the surface.

[0008] As a preferred embodiment of the present invention, the first fabric may have an opening ratio of 55 to 75%.

[0009] As a preferred embodiment of the present invention, the second fabric may have an opening ratio of 25 to 45%.

[0010] As a preferred embodiment of the present invention, the nanofiber web has a basis weight of 10 to 20 g / m² 2 And, the average diameter can be 150 to 350 nm.

[0011] As a preferred embodiment of the present invention, the first fabric has a basis weight of 25 to 35 g / m² 2 It could be.

[0012] As a preferred embodiment of the present invention, the second fabric has a basis weight of 15 to 25 g / m² 2 It could be.

[0013]

[0014] In this invention, the term "fiber" used means "yarn" or "thread," and refers to various common types of yarn and fiber.

[0015] The titanium dioxide-added nanodust mesh of the present invention not only has high dust collection efficiency but also excellent air permeability.

[0016] In addition, the titanium dioxide-added nanodust mesh of the present invention has excellent flame retardant performance, as well as excellent NOx removal efficiency and visible light transmittance.

[0017]

[0018] FIG. 1 is a cross-sectional view of a titanium dioxide-added nanodust filter mesh according to a preferred embodiment of the present invention.

[0019] FIG. 2 is a drawing showing a first fabric having a rectangular mesh shape according to a preferred embodiment of the present invention.

[0020] FIG. 3 is a drawing showing a second fabric having a hexagonal mesh shape according to a preferred embodiment of the present invention.

[0021] Figure 4 is a micrograph of the first fabric prepared in Example 1.

[0022] Figure 5 is a micrograph of the nanofiber web prepared in Example 1.

[0023] Figure 6 is a diagram showing the process of forming a nanofiber web by electrospinning on one side of the first fabric prepared with a polymer solution in Example 1.

[0024] Figure 7 is an SEM image of the first fabric prepared in Example 1.

[0025] Figure 8 is an SEM image of the nanofiber web prepared in Example 1.

[0026] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals are assigned to identical or similar components throughout the specification.

[0027]

[0028] Referring to FIG. 1, the titanium dioxide-added nano dustproof mesh of the present invention has a structure in which a first fabric (10), a nanofiber web (20), and a second fabric (30) are sequentially laminated.

[0029] First, the first fabric (10) may be woven into a square mesh shape using PAN (polyacrylonitrile) carbon fibers coated with polyvinyl chloride having a weight-average molecular weight of 38,000 to 58,000, preferably 43,000 to 53,000, as shown in FIG. 2. At this time, by satisfying the weight-average molecular weight range of polyvinyl chloride, it is possible to satisfy all effects, including high dust collection efficiency, excellent air permeability, excellent flame retardant performance, excellent NOx removal efficiency, and excellent visible light transmittance.

[0030] The carbon fiber may be a PAN (polyacrylonitrile)-based carbon fiber, a rayon-based carbon fiber, or a petroleum pitch-based carbon fiber, and preferably a PAN-based carbon fiber. The PAN-based carbon fiber is manufactured by carbonizing a PAN (Poly-Acrylonitrile) fiber obtained by polymerizing acrylonitrile and then spinning it at a high temperature, and is a fiber produced through the processes of polymerization, spinning, and calcination. Polymerization is a process of applying heat and pressure to acrylonitrile (AN) to make it into a polymer state, spinning is a process in which the polymer (PAN: Poly-Acrylonitrile) produced through the polymerization process is reborn as an acrylic fiber through the spinning process, and calcination is a process of oxidizing and carbonizing the produced acrylic fiber at a high temperature of 1,200°C or higher, and finally, the acrylic fiber that has undergone the calcination process has only the carbon (C) component remaining, thereby producing a PAN-based carbon fiber.

[0031] Meanwhile, the fineness of the PAN (polyacrylonitrile)-based carbon fiber can be 1 to 5 denier, preferably 2 to 3 denier.

[0032] In addition, the first fabric (10) has a basis weight of 25 to 35 g / m² 2 , preferably 28 to 32 g / m² 2 It could be.

[0033] In addition, the first fabric (10) may have an opening ratio of 55 to 75%, preferably 60 to 70%, and if it does not satisfy this range of opening ratios, there may be a problem in that it does not satisfy all the effects of having high dust collection efficiency, excellent air permeability, excellent flame retardant performance, excellent NOx removal efficiency, and excellent visible light transmittance.

[0034]

[0035] Next, the nanofiber web (20) may be formed by electrospinning a polymer solution onto one surface of the first fabric (10). The nanofiber web (20) is an aggregate of fibers having pores on the outer surface and / or inner surface, and the average diameter of the fibers constituting the nanofiber web (20) may be 150 to 350 nm, preferably 200 to 300 nm.

[0036] Meanwhile, the nanofiber web (20) may include polyvinylidene fluoride and reduced titanium dioxide.

[0037] Reduced titanium dioxide is produced by reducing titanium dioxide and may be blue titanium dioxide. Specifically, reduced titanium dioxide may be produced by adding lithium (Li) and titanium dioxide to an ethylenediamine solvent, stirring and reacting for 4 to 8 days under conditions of nitrogen and a temperature of 20 to 30°C to produce a reaction product, and neutralizing the produced reaction product with hydrochloric acid.

[0038] Specifically, the nanofiber web (20) may contain polyvinylidene fluoride and reduced titanium dioxide in a weight ratio of 1:0.05 to 0.3, preferably 1:0.06 to 0.2, and more preferably 1:0.08 to 0.13. If this weight ratio range is not satisfied, there may be a problem in that not only is the dust collection efficiency high, but the air permeability is excellent, the flame retardant performance is excellent, and the NOx removal efficiency and visible light transmittance are also excellent.

[0039] In addition, the nanofiber web (20) has a basis weight of 10 to 20 g / m 2 , preferably 13 to 17 g / m² 2 It could be.

[0040]

[0041] Finally, the second fabric (30) is formed by laminating it on one side of the nanofiber web (20), and as shown in FIG. 3, it may be made by weaving polyethylene terephthalate (PET) fibers into a hexagonal net shape.

[0042] The fineness of the polyethylene terephthalate (PET) fiber can be 0.5 to 2.5 denier, preferably 1 to 2 denier.

[0043] In addition, the second fabric (30) has a basis weight of 15 to 25 g / m² 2 , preferably 18 to 22 g / m² 2 It could be.

[0044] In addition, the second fabric (30) may have an opening ratio of 25 to 45%, preferably 30 to 40%, and if it does not satisfy this range of opening ratios, there may be a problem in that it does not satisfy all the effects of having high dust collection efficiency, excellent air permeability, excellent flame retardant performance, excellent NOx removal efficiency, and excellent visible light transmittance.

[0045]

[0046] Meanwhile, the method for manufacturing a titanium dioxide-added nanodust-proof mesh according to the present invention comprises steps 1 to 3.

[0047] First, the first step of the method for manufacturing a titanium dioxide-added nanodust-proof mesh of the present invention may be to prepare a first fabric. At this time, the first fabric prepared in the first step is as described above.

[0048] Next, the second step of the method for manufacturing a titanium dioxide-added nanodust-proof mesh according to the present invention may involve electrospinning a polymer solution onto one surface of the first fabric prepared in the first step to form a nanofiber web. At this time, the formed nanofiber web is as described above.

[0049] In addition, the polymer solution may be prepared by adding polyvinylidene fluoride and reduced titanium dioxide to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:0.8 to 1.2.

[0050] Finally, the third step of the method for manufacturing a titanium dioxide-added nanodust-proof mesh according to the present invention may be to manufacture a titanium dioxide-added nanodust-proof mesh by laminating a second fabric, which is woven from polyethylene terephthalate (PET) fibers into a hexagonal mesh shape, onto one side of the nanofiber web formed in the second step. At this time, the second fabric is as described above. Additionally, lamination can be performed by laminating the second fabric onto one side of the nanofiber web and then passing it through a heat-fusion roller, and for lamination, a binder resin generally used in the industry, such as polyurethane resin, may be used on the lamination surface of the second fabric.

[0051]

[0052] Although the present invention has been described above with reference to embodiments, this is merely illustrative and does not limit the embodiments of the present invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present invention. For example, each component specifically shown in the embodiments of the present invention may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention as defined in the appended claims.

[0053]

[0054] Preparation Example 1: Preparation of Reduced Titanium Dioxide

[0055] 350 mg of lithium (Li) and 500 mg of titanium dioxide (TiO2, dried TiO2 nanocrystals) with an average particle size of 21 nm were added to 50 mL of ethylenediamine solvent, and the mixture was stirred and reacted for 6 days under nitrogen and room temperature (25°C) conditions to prepare a reaction product. The prepared reaction product was neutralized with hydrochloric acid, mixed with water using a centrifuge, and purified and filtered to obtain a solid powder. The obtained solid powder was dried in a vacuum oven for one day to prepare reduced titanium dioxide.

[0056]

[0057] Example 1: Preparation of a titanium dioxide-added nanodust mesh

[0058] (1) A PAN (polyacrylonitrile)-based carbon fiber (fineness: 3.0 denier) was prepared with a surface coated with polyvinyl chloride having a weight-average molecular weight of 48,000. The prepared PAN-based carbon fiber was woven into a square mesh shape, with a basis weight of 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0059] (2) A polymer solution is prepared by adding polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared therefrom to obtain a basis weight of 15 g / m² 2 And, a nanofiber web with an average diameter of 250 nm was formed. At this time, polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 were added in a weight ratio of 1:0.1.

[0060] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0061]

[0062] Example 2: Preparation of a titanium dioxide-added nanodust filter mesh

[0063] (1) A PAN (polyacrylonitrile)-based carbon fiber (fineness: 3.0 denier) was prepared with a surface coated with polyvinyl chloride having a weight-average molecular weight of 48,000. The prepared PAN-based carbon fiber was woven into a square mesh shape, with a basis weight of 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0064] (2) A polymer solution is prepared by adding polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared therefrom to obtain a basis weight of 15 g / m² 2 And, a nanofiber web with an average diameter of 250 nm was formed. At this time, polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 were added in a weight ratio of 1:0.5.

[0065] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2 A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0066]

[0067] Example 3: Preparation of a titanium dioxide-added nanodust filter mesh

[0068] (1) PAN (polyacrylonitrile)-based carbon fiber (fineness: 3.0 denier) was prepared. The prepared PAN-based carbon fiber was woven into a square mesh shape, with a basis weight of 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0069] (2) A polymer solution is prepared by adding polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared therefrom to obtain a basis weight of 15 g / m² 2 And, a nanofiber web with an average diameter of 250 nm was formed. At this time, polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 were added in a weight ratio of 1:0.1.

[0070] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2 A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0071]

[0072] Example 4: Preparation of Titanium Dioxide-Added Nanodust Filter Mesh

[0073] (1) A PAN (polyacrylonitrile)-based carbon fiber (fineness: 3.0 denier) was prepared with a surface coated with polyvinyl chloride having a weight-average molecular weight of 30,000. The prepared PAN-based carbon fiber was woven into a square mesh shape, with a basis weight of 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0074] (2) A polymer solution is prepared by adding polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared therefrom to obtain a basis weight of 15 g / m² 2 And, a nanofiber web with an average diameter of 250 nm was formed. At this time, polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 were added in a weight ratio of 1:0.1.

[0075] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2 A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0076]

[0077] Example 5: Preparation of a titanium dioxide-added nanodust mesh

[0078] (1) A PAN (polyacrylonitrile)-based carbon fiber (fineness: 3.0 denier) coated with polyvinyl chloride having a weight-average molecular weight of 65,000 on its surface was prepared. The prepared PAN-based carbon fiber was woven into a square mesh shape, and the basis weight was 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0079] (2) A polymer solution is prepared by adding polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared therefrom to obtain a basis weight of 15 g / m² 2And, a nanofiber web with an average diameter of 250 nm was formed. At this time, polyvinylidene fluoride and reduced titanium dioxide prepared in Preparation Example 1 were added in a weight ratio of 1:0.1.

[0080] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2 A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0081]

[0082] Comparative Example 1: Preparation of a titanium dioxide-added nanodust-proof mesh

[0083] (1) Polyacrylonitrile (PAN) carbon fibers were prepared with a surface coated with polyvinyl chloride having a weight-average molecular weight of 48,000. The prepared PAN carbon fibers were woven into a square mesh shape, with a basis weight of 30 g / m² 2 And, a first fabric with an opening rate of 65% was prepared.

[0084] (2) A polymer solution is prepared by adding polyvinylidene fluoride to a mixed solvent in which dimethylformamide and acetone are mixed in a weight ratio of 1:1, and then the polymer solution is electrospinning on one side of the first fabric prepared with the polymer solution to obtain a basis weight of 15 g / m² 2 And, a nanofiber web with an average diameter of 250 nm was formed.

[0085] (3) Polyethylene terephthalate (PET) fiber (fineness: 1.5 denier) woven into a hexagonal mesh has a basis weight of 20 g / m² 2 A second fabric with an opening ratio of 35% was prepared. After laminating the second fabric onto one side of the nanofiber web, the two fabrics were passed through a heat-fusion roller to manufacture a titanium dioxide-added nano dustproof mesh.

[0086]

[0087] Experimental Example 1

[0088] The following physical properties were measured for each titanium dioxide-added nano dustproof mesh prepared through Examples 1 to 5 and Comparative Example 1 and are shown in Table 1 below.

[0089]

[0090] 1. Air permeability

[0091] JIS L 1096:2010 standard (Test area: 38 cm 2 Based on the pressure difference (125 Pa), the air permeability of each titanium dioxide-added nano dust filter prepared through Examples 1 to 5 and Comparative Example 1 was measured and is shown in Table 1 below.

[0092]

[0093] 2. Dust collection efficiency

[0094] Based on the gravimetric method (test wind speed: 1.0 m / s, terminal pressure loss: 76 mmAq, test dust: Nominal 0 ~ 10 Micon Arizona Test Dust) in accordance with ASHRAE STANDARD 52.2 : 2017, the dust collection efficiency of each titanium dioxide-added nano dust filter prepared through Examples 1 to 5 and Comparative Example 1 was measured and is shown in Table 1 below.

[0095]

[0096] 3. Flame retardant performance

[0097] National Fire Agency Notice No. 2022-29, Microburner Method (Sample Classification: Thin Fabric (450 g / m²) 2 Based on the combustion type (carbonization), the flame retardant performance of each titanium dioxide-added nano dustproof mesh prepared through Examples 1 to 5 and Comparative Example 1 was measured and is shown in Table 1 below.

[0098]

[0099] 4. NOx removal efficiency

[0100] KS L ISO 22197-1 Standard (Sample Pretreatment: UV Irradiation Before Testing (2 mW / cm²)2 ) 16 hours run, light irradiation conditions: PHILIS TL-D 15W ACTINIC LB 1 mW / cm² 2 Based on (5 hours of light irradiation, test gas flow rate: 3 L / min), the NOx removal efficiency of each titanium dioxide-added nano dust filter prepared through Examples 1 to 5 and Comparative Example 1 was measured and is shown in Table 1 below.

[0101]

[0102] 5. Visible light transmittance

[0103] In accordance with the FITI TM F 0008 : 2022 standard (wavelength range: 380 ~ 780 nm, wavelength interval: 10 nm), the visible light transmittance of each titanium dioxide-added nano dust filter prepared through Examples 1 to 5 and Comparative Example 1 was measured and is shown in Table 1 below.

[0104]

[0105]

[0106] As can be seen in Table 1 above, the titanium dioxide-added nano dust filter prepared in Example 1 not only exhibited the best dust collection efficiency, but also had high air permeability, excellent flame retardant performance, and excellent NOx removal efficiency and visible light transmittance.

[0107]

[0108] Simple variations or modifications of the present invention can be easily implemented by those skilled in the art, and all such variations or modifications are considered to be included within the scope of the present invention.

Claims

1. A titanium dioxide-added nanodust-proof mesh in which a first fabric, a nanofiber web, and a second fabric are sequentially laminated, The above nanofiber web is a titanium dioxide-added nanodust mesh characterized by comprising polyvinylidene fluoride and reduced titanium dioxide.

2. In Paragraph 1, The above nanofiber web is characterized by containing polyvinylidene fluoride and reduced titanium dioxide in a weight ratio of 1:0.05 to 0.3, forming a titanium dioxide-added nanodust mesh.

3. In Paragraph 1, Titanium dioxide-added nano dustproof mesh characterized by the first fabric being woven into a square mesh shape using PAN (polyacrylonitrile)-based carbon fibers coated with polyvinyl chloride having a weight-average molecular weight of 38,000 to 58,000 on its surface.

4. In Paragraph 1, The above-mentioned first fabric has an opening ratio of 55 to 75%, and The above second fabric is a titanium dioxide-added nano dustproof mesh characterized by having an opening ratio of 25 to 45%.

5. In Paragraph 1, The above nanofiber web is a titanium dioxide-added nanodust mesh characterized by being formed by electrospinning in which reduced titanium dioxide is incorporated into polyvinylidene fluoride.

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